Toos worked aboard the control deck, with one of her roles being to identify rich veins of ore. After Chub was murdered, Toos and the other crew members were gathered together by Commander Uvanov to discuss the situation. Toos was dissuaded by Dask from following Borg and Cass to actively search for the Fourth Doctor and Leela, who were suspected of the murder given that they were an unknown quantity. When they were captured, Toos agreed that the Doctor's claims that he was not responsible were plausible given that "as a lie [it was] pretty feeble".